public static CompositeDisposable TrackChanges <T>(this IReactiveList <T> list, Action <T> add, Action <T> remove,
Action <ICollection <T> > reset, Func <T, bool> filter = null)
{
if (list == null)
{
throw new ArgumentNullException(nameof(list));
}
var disposables = new CompositeDisposable();
if (add != null)
{
var o = list.ItemsAdded;
if (filter != null)
{
o = o.Where(filter);
}
disposables.Add(o.Subscribe(add));
}
if (remove != null)
{
var o = list.ItemsRemoved;
if (filter != null)
{
o = o.Where(filter);
}
disposables.Add(o.Subscribe(remove));
}
if (reset != null)
{
disposables.Add(list.ShouldReset
.Subscribe(x => reset(filter == null ? list.ToArray() : list.Where(filter).ToArray())));
}
return(disposables);
}
